mr/raspberry_pi_epaper_button の履歴(No.1)

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• mr/raspberry_pi_epaper_button へ行く。
  • 1 (2024-08-19 (月) 15:39:36)
  • 2 (2024-08-19 (月) 16:19:44)

ラズパイでe-paperのボタン押下を取得する†

使ったもの

• Raspberry Pi 3B+ with "Debian GNU/Linux 12 (bookworm)"
• 264x176, 2.7inch E-Ink display HAT for Raspberry Pi, SPI interface | WF10190CZ22
  • 秋葉原 千石通商で買えます（WaveShare 13354 2.7インチ 264×176 E-Ink 電子ペーパーモジュール for RaspberryPi）

4つのボタン（key1 .. key4）のGPIOピンアサイン

• 2.7inch e-Paper HAT Manual - Waveshare Wiki

ちょっと古いサンプルコード

• Key example · waveshareteam/e-Paper@22032b7 · GitHub
• 残念なことに、bookwormだと動かない（RPi.GPIO.add_event_detect()がエラーを吐く）

gpiozero で書き換え

#!/usr/bin/python3
# -*- coding:utf-8 -*-
# vim:fenc=utf-8 ff=unix ft=python ts=4 sw=4 sts=4 si et ar :

# Python: Python RuntimeError GPIO
# https://copyprogramming.com/howto/python-runtimeerror-gpio

# Question:Do you have any sample about how to use those 4 keys on the side of display
# (labeled key1 key2 key3 key4)?
# https://www.waveshare.com/wiki/2.7inch_e-Paper_HAT_Manual#accordion31

from gpiozero import Button
from signal import pause
import sys


def handle(button_number):
    print(button_number, file=sys.stdout, flush=True)


key1 = 5
key2 = 6
key3 = 13
key4 = 19

try:
    button1 = Button(key1, pull_up=True)
    button2 = Button(key2, pull_up=True)
    button3 = Button(key3, pull_up=True)
    button4 = Button(key4, pull_up=True)

    button1.when_pressed = lambda: handle(1)
    button2.when_pressed = lambda: handle(2)
    button3.when_pressed = lambda: handle(3)
    button4.when_pressed = lambda: handle(4)

    pause()  # ボタンイベント待機
except KeyboardInterrupt:
    print("\nProgram interrupted. Cleaning up GPIO...", file=sys.stderr)
finally:
    print("GPIO cleanup complete.", file=sys.stderr)


# Key example · waveshareteam/e-Paper@22032b7 · GitHub
# https://github.com/waveshareteam/e-Paper/commit/22032b7cc1ed1669a914c6177017c718ce9d1218

# 2.7inch e-Paper: How to read the Keys on Raspberry PI?: · Issue #89
# https://github.com/waveshareteam/e-Paper/issues/89

利用例

"$SCRIPT_DIR/button-13354-stdout" | while read -r b; do
  case "$b" in
    1 | 4)
      curl -sSL 'https://radi.gost.kkhm.tokyo/cgi-bin/ffp-cron?option=-T' &
      ;;
    3)
      sudo reboot &
      ;;
  esac
done